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It remained unclear Tuesday night which candidates would fill any of San Francisco’s contested supervisorial seats.

No clear leaders had emerged for districts 2, 6, 8 or 10 by 11:30 p.m., with San Francisco’s ranked-choice voting system obscuring final outcomes.

Incumbents were termed out of all four of those districts. Incumbent Carmen Chu ran unopposed for District 4, which includes the Sunset District and other western neighborhoods.

Under the ranked-choice system, first-ranked votes from losers are redistributed among their competitors based on voters’ second and third preferences.

Janet Reilly and Mark Farrell were the clear leaders to replace Supervisor Michela Alioto-Pier in District 2, which includes the Marina and other affluent neighborhoods in northwest San Francisco.

Reilly had received roughly 42 percent of the first-choice votes, and Farrell had received 39 percent when counting was nearing its end.

Jane Kim and Debra Walker were leading the race to represent District 6, which is a high-density area that includes downtown as well as the Tenderloin and other low-income neighborhoods filled with residential hotels, studios and one-bedroom apartments.

The district’s current supervisor is firebrand politician Chris Daly, who is ineligible to run for re-election.

With most of the first-choice votes counted on Tuesday evening, Kim had secured roughly 31 percent of the votes and Walker had 28 percent.

Scott Wiener and Rafael Mandelman on Tuesday night were the clear front runners to represent District 8, which lies at San Francisco’s geographical heart and includes the Castro neighborhood.

Wiener was leading the race, with approximately 42 percent of the first-rank votes; Mandelman had secured 36 percent. The current supervisor is Bevan Dufty.

Tony Kelly, Lynette Sweet, Malia Cohen and Steve Moss were leading the 21-person race to represent District 10, which covers southeastern San Francisco and contains some of its most impoverished communities. It is currently represented by Supervisor Sophie Maxwell.

Each of the four leading candidates for District 10 had received between 11 percent and 13.5 percent of the first-choice votes.